We present a precise lattice QCD determination of the b-quark mass, of the B and Bs decay constants and first results for the B-meson bag parameters. For our computation we employ the so-called ratio method and our results benefit from the use of improved interpolating operators for the B-mesons. QCD calculations are performed with Nf = 2 dynamical light-quarks at four values of the lattice spacing and the results are extrapolated to the continuum limit. The preliminary results are mb(mb) = 4.35(12) GeV for the MSbar b-quark mass, fBs = 234(6) MeV and fB = 197(10) MeV for the B-meson decay constants, BBs(mb) = 0.90(5) and BB(mb) = 0.87(5) for the B-meson bag parameters.
@article{arxiv.1212.0301,
title = {B-physics from lattice QCD...with a twist},
author = {N. Carrasco and P. Dimopoulos and R. Frezzotti and V. Gimenez and G. Herdoiza and V. Lubicz and G. Martinelli and C. Michael and D. Palao and G. C. Rossi and F. Sanfilippo and A. Shindler and S. Simula and C. Tarantino},
journal= {arXiv preprint arXiv:1212.0301},
year = {2012}
}
Comments
6 pages, 3 figures. Proceedings of the 36th International Conference on High Energy Physics - ICHEP 2012; July 4-11 2012; Melbourne, Australia